How to switch to Inverse Kinematic for Make Human model in blender 2.78?
You need to check "Override Exported Data" when importing the mhx2 file, and add a rig:



The rig controls are under the "MHX2 Runtime" tab (Layers and "FK/IK Switch") in the tools panel. The MakeWalk addon is not needed for this, only the MakeHuman import-runtime.